How to do development on your local machine for a subdomain with auth?

[progrmoiz]

For example, logging in on localhost:3000 and keeping that session for app.localhost:3000.

On Vercel it seems to work fine, like with an actual domain, but on your local machine with localhost:3000 it only stores it for localhost:3000.

[steven-tey]

We recently switched to localhost:8888 for the app (app.dub.co) and home.localhost:8888 for the landing page (dub.co) for this very reason, since Google auth doesn't allow for localhost subdomains